There is a high risk for exposure of the groundwater contaminated with carcinogenic xylidine to the drinking water wells with the resultant impacts on human health.

The residual xylidine in the stream of column bottoms was destroyed using advanced oxidation processes with UV photolysis, UV/hydrogen peroxide, photo-Fenton's reaction, and dark Fenton's reaction.

Because of low concentration of xylidine in groundwater, the effectiveness of the biodegradation process is questionable.

A possible explanation is that the xylidine adsorption equilibrium follows the Freundlich isotherm while the Rice method uses the linear isotherm and the Thomas method uses the Langmuir isotherm equation.

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